| Topic: |
Science > Physics |
| User: |
"Golden Boar" |
| Date: |
16 Jan 2005 01:32:25 AM |
| Object: |
Sparks |
When a spark is created between two contacts, are the contacts
attracted to each other?
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| User: "Uncle Al" |
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| Title: Re: Sparks |
16 Jan 2005 03:49:50 PM |
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Golden Boar wrote:
When a spark is created between two contacts, are the contacts
attracted to each other?
New idiot on board.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf
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| User: "Golden Boar" |
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| Title: Re: Sparks |
19 Jan 2005 01:47:00 AM |
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Uncle Al wrote:
Golden Boar wrote:
When a spark is created between two contacts, are the contacts
attracted to each other?
New idiot on board.
Yes, its about time YOU showed up.
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| User: "Gregory L. Hansen" |
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| Title: Re: Sparks |
16 Jan 2005 04:18:51 PM |
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In article <1105860745.960745.153200@c13g2000cwb.googlegroups.com>,
Golden Boar <goldenboar@hotmail.com> wrote:
When a spark is created between two contacts, are the contacts
attracted to each other?
They'll be attracted to each other *before* the spark, since a spark
requires a potential difference between the two (think positively and
negatively charged). And the contacts might weld when you touch them, if
you want to call that attraction.
--
"Not that there's anything wrong with just lying around on your back. In
its way, rotting is interesing too... It's just that there are other ways
to spend your time as a cadaver." -- Mary Roach, "Stiff", 2003.
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| User: "k3ym4st3r" |
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| Title: Re: Sparks |
17 Jan 2005 07:49:49 PM |
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I guess my "guess" wasn't that wrong
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| User: "Franz Heymann" |
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| Title: Re: Sparks |
18 Jan 2005 02:04:24 AM |
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"k3ym4st3r" <k3ym4st3r@yahoo.com> wrote in message
news:1106012989.159047.292020@z14g2000cwz.googlegroups.com...
I guess my "guess" wasn't that wrong
If you intend that anybody should pay any attention to what you are
saying, you should leave the relevant headers and context intact.
As things are, I don't care a fig what guess it was about which topic
which may, or may not, have been that wrong.
ranz
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| User: "k3ym4st3r" |
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| Title: Re: Sparks |
18 Jan 2005 10:29:34 PM |
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sure, whatever
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| User: "k3ym4st3r" |
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| Title: Re: Sparks |
16 Jan 2005 01:42:16 AM |
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the contacts are attracted to each other even before the spark is
created
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| User: "Bert Hickman" |
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| Title: Re: Sparks |
16 Jan 2005 01:13:57 PM |
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k3ym4st3r wrote:
the contacts are attracted to each other even before the spark is
created
Nice guess, but wrong...
Just prior to separation, current-carrying contacts are actually
repelled from one another by Lorentz forces. Since the repulsion force
is a function of the square of the current flow, this can be a very
significant problem for high current switches, relays, and circuit
breakers in high current circuits or during commercial power circuit
faults.
Just prior to separation, current is constricted to very small contact
region, causing contact heating, melting, and vaporization at the
instant of separation. Thermionic emission and ions from evaporated
contact material then support sparking (or potentially sustained
arcing) within the gap. As current continues to flow within the spark
(or arc), there will continue to be a net repulsive force between the
contacts that is proportional to the square of the current flow.
-- Bert --
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| User: "Golden Boar" |
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| Title: Re: Sparks |
16 Jan 2005 03:01:42 AM |
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thanks
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